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JPS5680997

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DESCRIPTION JPS5680997
Description 1, title of the invention
Vibrator of sounding body
3. Detailed Description of the Invention In a sound generator for an electronic watch, not only
alarms and melodies, but also sound emission has come to be required. Sound reproduction full
sound quality 1 is required that the band of the sounding body is up to about several hundred to
3KH2 · Diaphragm obtained by heat molding 1-polypropylene, polyarylate resin is about 20φ ×
OO8 And it is possible to cover the aforementioned bands. However, as described later, in such a
diaphragm, divided vibrations easily occur in a low frequency region, and the sound quality often
deteriorates. The object of the present invention is to eliminate the above-mentioned drawbacks
and to reproduce the sound efficiently, and relates to the shape of the diaphragm. Hereinafter,
the present invention will be described in detail based on the drawings. Fig. 1 is a cross-sectional
view of a diaphragm of a conventionally known sounding body, Fig. 2 is an explanatory view of
divided vibration in a low frequency region, and Fig. 3 is a top view A and a cross-sectional view
B of the diaphragm of the present invention. FIG. As in the case of a watch, in the case of a
sounding body that requires thinness of its character earth, the structure tends to be similar to a
flat diaphragm. With a simple flat diaphragm, divided vibrations are easily generated. As shown
in FIG. 2, it is conceivable to increase the rigidity by making the central portion of the diaphragm
flat, that is, in FIG. 1 is the whole diaphragm of the sounding body, 1 is one diaphragm heatmolded with polypropylene, polyarylate resin, etc., 2 is a corrugation portion, 5 is an edge of the
diaphragm, 4 is its supporting member (details omitted), 3 is a voice coil of cylindrical winding.
In FIG. 2, EndPage: 11 is an imaging plate, and 6 is a node outside the field where divided
vibration occurs at low frequency. Even with the configuration of FIG. 1, it is difficult to eliminate
divided vibrations as shown in FIG. 2. The second figure shows an embodiment of the present
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invention, and a diaphragm in the vicinity of a voice coil on concentric circles is shown. Of the
plurality of radial projections 1α-S1h11C11d, le, 1f, 1! i, IA '(eight in the embodiment) are
provided by heat molding. Corrugation part 21. Edge 5 is similar to the diaphragm of FIG. If
configured in this way, bending in the central part: rigidity is increased, and the low frequency of
the band is substantially determined by the corrugation part 2. Therefore, divided vibration in
the low band does not occur, and good quality speech reproduction is possible.・ Also, the
diaphragm material is not limited to simple polypropylene or polyarylate resin, but it is also
possible to use a composite moving plate material having a large internal loss such as a polymer
with graphite, etc. (If a material having a large internal loss is used For example, even if the
divided vibration occurs, its amplitude can be reduced.
Furthermore, the number of radial projections according to the present invention may be
appropriately increased or decreased according to the 9 frequencies of the divided vibration. 0
According to the present invention, the diaphragm can be formed by a simple shape and a simple
heat molding. The cost is low, the performance is good and the practical effect is remarkable.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of the conventional
diaphragm shape, FIG. 2 is a low frequency split shooting explanatory view of low frequency, FIG.
3 b, the mouth is the upper surface of the diaphragm of the present invention. FIG. U: Diaphragm
0 whole main view, 1: Diaphragm, 2 ... Corrugation part, 3 ... Voice coil, 4 ... "End support
member, 5 ... Diaphragm edge. , 1 α to 1 h: radial protrusion, 1 A: peripheral portion of cap.
EndPage: 2
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